Chloe Adams
Candling is a simple method used to check if an egg is fertile and developing properly. It involves holding a light source up to the egg to illuminate it, allowing you to observe the development of the embryo. This process is usually done in a dark room to better see what's going on inside the egg. When candling, there are several indicators of normal development to look out for, such as veins, blood vessels, and the size of the air pocket. On the other hand, signs of a bad egg include a vague ring, a distinct blood spot, and lack of development compared to other eggs. By candling eggs, you can identify and remove non-viable eggs, preventing contamination and ensuring a healthier hatch.
| Characteristics | Values |
|---|---|
| Day 3 | Veins may start to be apparent |
| Day 3-6 | You may be able to see the heart beating with the naked eye |
| Day 7 | Check for early signs of life, such as a small dark spot (the embryo) with red veins branching out and a visible air sac |
| Day 8 | You can see the chick wiggling and kicking in its egg |
| Day 14 | By now, a healthy chick should take up most of the egg. Look for a darker interior, less light passing through and continued movement. If it still looks clear or hasn’t changed since Day 7, the egg likely isn’t viable and should be removed |
| Day 14 onwards | You can't see much other than the increasing air sac size, and the egg is full of a chick |
| Air cell abnormalities | If the air cell develops at the pointy end of the egg, flip the egg so that it’s positioned air cell up in your egg turner |
| If the air cell is trending large | Increase humidity |
| If the air cell is trending small | Decrease humidity |
| Cracked eggs | Likely to become infected, causing premature death |
| Infertile eggs | The egg will look clear with no dark spot or blood vessels |
| Rotten eggs | These can sometimes explode, contaminating other eggs |
| Dark-shelled eggs | Harder to see through, so you will need the brightest light source possible |
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What You'll Learn
How to candle an egg
Candling is a simple method used to check if an egg is fertile and developing properly. It involves holding a light source up to the egg to illuminate it so that you can see what is developing inside. This allows you to remove any non-developing eggs so that they don't rot and explode in your incubator.
Step 1: Prepare the room
Candling works best in a dark room, so turn off the lights or candle in a closet. If your incubator is set up so that the eggs are lying on their side, you may need to reposition them to get a good look. Using an empty egg carton to place the eggs temporarily is a great choice.
Step 2: Prepare the egg
Wash your hands before and after handling eggs. Oil from your fingers can clog the pores in the egg shell and keep the embryo from getting the oxygen it needs.
Step 3: Candle the egg
After a week of incubation, place your egg onto your egg candler and turn on the light. You should be able to see shadows from inside the egg. With practice, you will identify fertile eggs by the dark dot, the embryo and the spider-like blood veins spreading out around the egg. Rotate the egg until you get the best view. If you're still not seeing it clearly, then it's best to wait another day or two before trying again.
Step 4: Remove non-viable eggs
If the egg is clear with no dark spot or blood vessels, it is likely infertile and should be removed. If the egg still looks clear after two weeks, it likely isn't viable and should be removed.
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Identifying fertile eggs
Candling is a process used to determine whether an egg is fertile or not. It involves illuminating the egg's interior with a bright light, allowing the observer to see what is inside the shell. To candle an egg, one must place it onto an egg candler in a darkened room and turn on the light. With practice, one will be able to identify fertile eggs by observing a dark dot, the embryo, and the spider-like blood veins spreading out from the centre of the egg.
Initially, it can be challenging to locate the embryo, as it may be in the centre or on the opposite side of the egg. In such cases, rotating the egg can help to get a better view. If the embryo is still challenging to see, it is advisable to wait another day or two before trying again. However, if the embryo is positioned against the shell, it will be much easier to observe, and one may even be lucky enough to see it moving or witness its heartbeat.
After about a week of incubation, a fertile egg will typically display a dark spot, representing the embryo, with spider-like veins extending around it. If the egg is a "yolker", meaning it was never fertilised, it will remain relatively clear, lacking any visible dark spots, blood vessels, or blood rings. It is important to distinguish and remove "yolkers" and "quitters" (eggs that stopped developing during incubation) to prevent them from rotting and bursting inside the incubator, which can contaminate other eggs.
When candling eggs, it is recommended to ensure clean and dry hands to avoid oil from the fingers clogging the pores in the shell, which could hinder the embryo's oxygen supply. Additionally, eggs can be safely removed from the incubator for up to 30 minutes during the candling process.
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Removing non-viable eggs
Candling eggs is a crucial technique used to identify non-viable eggs during the incubation process. It involves illuminating the egg with a bright light source, such as a flashlight or a special candling torch, to observe the interior for signs of development. By understanding what to look for during candling, you can effectively remove non-viable eggs and optimise the hatching process.
Identifying Non-Viable Eggs
When candling eggs, there are several indicators to look for to determine if an egg is non-viable. Firstly, examine the air sac, which is typically located at the larger end of the egg. A small or non-existent air sac could indicate that the egg is not viable. Additionally, pay attention to the eggshell quality. While the pores of the shell may not be visible, a shell that appears too thick or cloudy might suggest poor quality. Clear eggs, on the other hand, often signify good shell quality and improved chances for embryo survival.
Another crucial aspect to observe is the yolk. Although a clear separation between the yolk and the egg white is generally favourable during the early stages, a moving yolk that resembles a swirling cloud could indicate a broken yolk, rendering the egg non-viable. Additionally, look for the presence of a network of blood vessels or a "web" around the yolk, which indicates a growing embryo. Conversely, a red ring around the yolk, known as a blood ring, signifies terminated development, and the egg should be discarded.
Once you have identified non-viable eggs through candling, it is essential to remove them promptly. Non-viable eggs can turn rotten and contaminate other healthy eggs in the incubator. By removing these eggs, you prevent the risk of explosion or oozing, which can introduce bacteria and cause other eggs to spoil. Mark any questionable eggs and re-evaluate them after a few days to confirm if they are non-viable. This process helps maintain a healthy environment for the viable eggs and optimises the chances of successful hatching.
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Monitoring air cell development
Initially, the air cell is very small, but it gradually increases in size as incubation progresses. By the 24th to 27th day of incubation, depending on the breed, the air cell should occupy almost half of the egg. It should be slightly slanting downwards, and its size indicates the humidity levels. If the air cell is too small, it suggests that the humidity is too high, which can lead to the chick drowning in the egg. On the other hand, if the air cell is too large, it indicates that the humidity is too low, making it difficult for the chick to turn and escape the egg.
To accurately monitor air cell development, it is essential to candle eggs regularly and maintain a record of observations. Mark the size of the air sac onto the eggshell using a soft pencil, allowing you to compare it with other eggs and track its growth over time. Additionally, you can use a diagram or chart to compare the observed air cell size with the expected size at a particular incubation stage. This information helps in adjusting the humidity levels accordingly to ensure optimal conditions for embryo development.
Candling eggs also help identify non-viable eggs, which can be removed to maintain a healthy environment for the developing embryos. By observing the size of the air cell and tracking its changes, you can make informed decisions about the incubation process and increase the chances of successful hatching.
Furthermore, candling eggs can reveal the presence of a "'blood line,'" indicating that the embryo has died. This information is valuable in understanding potential causes of death and eliminating certain factors to improve future hatching success. Overall, monitoring air cell development through egg candling is a crucial aspect of ensuring the viability and healthy development of embryos during the incubation process.
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Best practices
Candling eggs is a simple method used to check if an egg is fertile and developing properly. It involves holding a light source up to the egg to illuminate it so that you can observe what is developing inside. Here are some best practices to follow when candling eggs:
Prepare your workspace
Before you begin, ensure your incubator is set up correctly. If your eggs are laying on their side, you may need to reposition them to get a better view. Using an empty egg carton to place the eggs temporarily is a great option. It is also recommended to candle in front of your incubator to reduce the chances of accidents from dropping the eggs. Having a folded fluffy towel in front of you can provide a padded area to candle.
Timing
The best time to candle eggs is after a week of incubation. You can candle again after 14 days, but not after you've stopped turning your eggs during the last few days before they hatch. Typically, chicken eggs are finished rotating at 18 days, and duck eggs at 25 days.
Lighting
To get the best view of the egg's contents, candle your eggs in a darkened room at night. The less light pollution you have in the room, the better you will be able to see what's going on inside the egg. If you are candling dark-shelled eggs, such as Marans or Welsummer Eggs, you will need the brightest light source possible.
Identify what to look for
Fertile eggs will show a small dark spot (the embryo) with red veins branching out and a visible air sac. If you don't see veins or an air sac, the egg isn't likely developing. By day 14, a healthy chick should take up most of the egg, making the interior darker with less light passing through. If it still looks clear or unchanged since day 7, the egg is likely non-viable and should be removed.
Hygiene
Ensure your hands are clean and dry before handling the eggs. Oil from your fingers can clog the pores in the egg shell and prevent the embryo from getting the oxygen it needs. Additionally, bacteria can be transferred to the eggs if you haven't washed your hands.
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Frequently asked questions
Candling is a simple method used to check if an egg is fertile and developing properly. It involves holding up a light source to the egg to illuminate it.
You should look for signs of development, including veins, blood vessels, and movement. A fertile egg will show a small dark spot (the embryo) with red veins branching out and a visible air sac. If you don't see veins or an air sac, the egg isn't likely developing.
It is recommended to candle at least 3 times during incubation to monitor development and discard any non-developing eggs. Some sources suggest candling on days 7 and 14, while others suggest candling daily after day 3.
